    .colorful{
            /* 偶数个 */
            /*background-image: linear-gradient(to right, red, yellow, purple, purple, yellow, red, yellow, purple, purple, yellow, red); */
 
            /* 奇数个 */
            background-image: linear-gradient(to right, red, orange, yellow, green, blue, green, yellow, orange, red, orange, yellow, green, blue, green, yellow, orange, red);    
            -webkit-text-fill-color: transparent;
            -webkit-background-clip: text;
            -webkit-background-size: 200% 100%;
            animation: bgp 5s infinite linear;
        }
        @-webkit-keyframes bgp{
            0%{
                background-position: 0 0;
            }
            100%{
                background-position: -100% 0;
            }
        }
        .colorful a {
            margin-right: 5px;
            text-decoration: none;
            padding: 3px 0;
        }